#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2021, CISOfy
#
# Website  : https://cisofy.com
# Blog     : http://linux-audit.com
# GitHub   : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
######################################################################
#
# Helper program to share details
#
######################################################################
#
# How to use:
# ------------
# Run: lynis show <option>
#
######################################################################

COMMANDS="audit configure generate show update upload-only"
HELPERS="audit configure show update"
OPTIONS="--auditor\n--cronjob (--cron)\n--debug\n--developer\n--devops\n--forensics\n--help (-h)\n--log-file\n--manpage (--man)\n--no-colors\n--no-log\n--no-plugins\n--pentest\n--profile\n--plugin-dir\n--quick (-Q)\n--quiet (-q)\n--report-file\n--reverse-colors\n--tests\n--tests-from-category\n--tests-from-group\n--usecwd\n--upload\n--verbose\n--version (-V)\n--wait\n--warnings-only"

SHOW_ARGS="categories changelog commands dbdir details environment eol groups help hostids includedir language license logfile man options os pidfile plugindir profiles release releasedate report settings tests version workdir"
SHOW_HELP="lynis show ${BROWN}categories${NORMAL}              (display test categories)
lynis show ${BROWN}changelog${NORMAL} ${GRAY}[version]${NORMAL}     (release details)
lynis show ${BROWN}commands${NORMAL}                (all available commands)
lynis show ${BROWN}dbdir${NORMAL}                   (database directory)
lynis show ${BROWN}details${NORMAL}                 (display test details from log file)
lynis show ${BROWN}environment${NORMAL}             (hardware, virtual machine, or container type)
lynis show ${BROWN}eol${NORMAL}                     (OS end-of-life status)
lynis show ${BROWN}groups${NORMAL}                  (test groups)
lynis show ${BROWN}help${NORMAL}                    (detailed information about arguments)
lynis show ${BROWN}hostids${NORMAL}                 (unique IDs for this system)
lynis show ${BROWN}includedir${NORMAL}              (include directory for tests and functions)
lynis show ${BROWN}language${NORMAL}                (configured or detected language)
lynis show ${BROWN}license${NORMAL}                 (license details)
lynis show ${BROWN}logfile${NORMAL}                 (location of logfile)
lynis show ${BROWN}man${NORMAL}                     (show help)
lynis show ${BROWN}options${NORMAL}                 (available flags and options)
lynis show ${BROWN}os${NORMAL}                      (operating system and version)
lynis show ${BROWN}pidfile${NORMAL}                 (active file to stored process ID)
lynis show ${BROWN}plugindir${NORMAL}               (directory with plugins)
lynis show ${BROWN}profiles${NORMAL}                (discovered profiles)
lynis show ${BROWN}release${NORMAL}                 (version)
lynis show ${BROWN}releasedate${NORMAL}             (date of release)
lynis show ${BROWN}report${NORMAL}                  (location of report data)
lynis show ${BROWN}settings${NORMAL}                (display configured settings, ${WHITE}options:${NORMAL} ${CYAN}--brief --nocolors${NORMAL})
lynis show ${BROWN}tests${NORMAL} ${GRAY}[test]${NORMAL}            (display information about one or more tests)
lynis show ${BROWN}tests skipped${NORMAL}           (which tests to skip according profile)
lynis show ${BROWN}version${NORMAL}                 (${PROGRAM_NAME} version)
lynis show ${BROWN}workdir${NORMAL}                 (work directory)"

AUDIT_ARGS="( dockerfile | system )"
AUDIT_HELP="
  ${WHITE}lynis audit <target>${NORMAL}

  ${CYAN}audit dockerfile ${BROWN}<file>${NORMAL}

  Perform security audit on a Docker build file
  ${GRAY}Example:${NORMAL}
    lynis audit dockerfile Dockerfile


  ${CYAN}audit system ${GRAY}[options]${NORMAL}

  Perform security system audit

  ${GRAY}Examples:${NORMAL}
    lynis audit system
    lynis audit system --cronjob
    lynis audit system --profile developer.prf
    lynis audit system --quick


  ${CYAN}audit system remote ${BROWN}<target> ${GRAY}[options]${NORMAL}

  Perform security system audit on a remote target

  ${GRAY}Examples:${NORMAL}
    lynis audit system remote 192.168.1.100
    lynis audit system remote 192.168.1.100 --no-colors

"

GENERATE_ARGS="( --save )"
GENERATE_HELP="
  Generate random value for hostid and hostid2
  ${WHITE}lynis generate hostids${NORMAL}

  Generate and save values
  ${WHITE}lynis generate hostids --save${NORMAL}

  Generate systemd units to run Lynis on a schedule (e.g. daily)
  ${WHITE}lynis generate systemd-units${NORMAL}

"


UPDATE_ARGS="check | info"
UPDATE_HELP="
  ${CYAN}update info${NORMAL}

  Check and show version information

  ${CYAN}update check${NORMAL}

  Just check if version is up-to-date

"

UPLOAD_ONLY_HELP="
  ${CYAN}update-only${NORMAL}

  Perform just a data upload

"

SHOW_SETTINGS_ARGS="--brief --configured-only --nocolors"
SHOW_TESTS_ARGS="skipped"

COMMANDS_AUDIT_SYSTEM_USAGE="Usage: lynis audit system"
COMMANDS_AUDIT_SYSTEM_FUNCTION="Function: performs a security audit of the system"

if [ $# -gt 0 ]; then
    case $1 in
        "categories")
            ViewCategories
            ;;
        "changelog")
            # Allow providing a version
            if [ $# -gt 1 ]; then
                shift; SEARCH_VERSION="$1"
            fi
            PROGRAM_NAME_LOWER=$( echo ${PROGRAM_NAME} | tr '[:upper:]' '[:lower:]')
            CHANGELOG_PATHS="/usr/share/doc/${PROGRAM_NAME} /usr/share/doc/${PROGRAM_NAME}-${PROGRAM_VERSION} /usr/share/doc/${PROGRAM_NAME_LOWER} ."
            CHANGELOG=""
            if [ -z "${SEARCH_VERSION}" ]; then SEARCH_VERSION="${PROGRAM_VERSION}"; fi
            STARTED=0
            for FILEPATH in ${CHANGELOG_PATHS}; do
                if [ -f ${FILEPATH}/CHANGELOG.md ]; then
                    CHANGELOG="${FILEPATH}/CHANGELOG.md"
                # Check also for gzipped changelog
                elif [ -f ${FILEPATH}/changelog.gz ]; then
                    ZCAT=$(which zcat 2> /dev/null | grep -v "no [^ ]* in ")
                    if [ -n "${ZCAT}" ]; then
                        CreateTempFile
                        CHANGELOG="${TEMP_FILE}"
                        LogText "Result: found gzipped changelog in ${FILEPATH}"
                        LogText "Action: Creating temporary file to store text"
                        ${ZCAT} ${FILEPATH}/changelog.gz > ${CHANGELOG}
                    else
                        DisplayError "Could not find zcat utility to use on gzipped changelog"
                    fi
                fi
                if [ -n "${CHANGELOG}" ]; then LogText "Result: found changelog file: ${CHANGELOG}"; break; fi
            done
            if [ -n "${CHANGELOG}" ]; then
                SEARCH=$(sed 's/^## //' ${CHANGELOG} | grep -E "^${PROGRAM_NAME} ${SEARCH_VERSION}")
                if [ $? -eq 0 ]; then
                    while read -r LINE; do
                        if [ ${STARTED} -eq 0 ]; then
                            SEARCH=$(echo ${LINE} | sed 's/^## //' | grep -E "^${PROGRAM_NAME} ${SEARCH_VERSION}")
                            if [ $? -eq 0 ]; then STARTED=1; ${ECHOCMD} "${BOLD}${LINE}${NORMAL}"; fi
                        else
                            # Stop if we find the next Lynis version
                            SEARCH=$(echo ${LINE} | sed 's/^## //' | grep -E "^${PROGRAM_NAME} [0-9]\.[0-9]\.[0-9]")
                            if [ $? -eq 0 ]; then
                                break
                            else
                                ${ECHOCMD} "${LINE}"
                            fi
                        fi
                    done < ${CHANGELOG}
                else
                    DisplayError "Could not find this version in the changelog"
                    ${ECHOCMD} ""
                    ${ECHOCMD} "${HEADER}Usage:${NORMAL}"
                    ${ECHOCMD} "$0 lynis show changelog [version]"
                    ${ECHOCMD} ""
                    ${ECHOCMD} "${HEADER}${PROGRAM_NAME} versions:${NORMAL}"
                    SEARCH=$(sed 's/^## //' ${CHANGELOG} | grep -E "^Lynis [0-9]\.[0-9]\.[0-9] " | awk '{print $2}' | sort -n)
                    ${ECHOCMD} ${SEARCH}
                    ExitFatal
                fi
            else
                DisplayError "Could not find the changelog file (searched in ${CHANGELOG_PATHS})"
                ExitFatal
            fi
            ;;
        "commands")
            if [ $# -eq 1 ]; then
                ${ECHOCMD} "\n${WHITE}Commands:${NORMAL}"
                for ITEM in ${COMMANDS}; do
                    ${ECHOCMD} "lynis ${CYAN}${ITEM}${NORMAL}"
                done
                ${ECHOCMD} ""
            else
                shift
                if [ $# -eq 1 ]; then
                    case $1 in
                        "audit") ${ECHOCMD} "${AUDIT_HELP}" ;;
                        "configure") ${ECHOCMD} "No help available yet" ;;
                        "generate") ${ECHOCMD} "${GENERATE_HELP}" ;;
                        "show") ${ECHOCMD} "${SHOW_HELP}" ;;
                        "update")  ${ECHOCMD} "${UPDATE_HELP}" ;;
                        "upload-only") ${ECHOCMD} "${UPLOAD_ONLY_HELP}" ;;
                        *) DisplayError "Unknown argument for 'commands'"
                    esac
                else
                    shift
                    case $1 in
                        "dockerfile")
                            ${ECHOCMD} "Usage: lynis audit dockerfile <file>"
                        ;;
                        "system")
                            ${ECHOCMD} "${COMMANDS_AUDIT_SYSTEM_USAGE}\n${COMMANDS_AUDIT_SYSTEM_FUNCTION}\n"
                        ;;
                        *)
                            DisplayError "Unknown argument '$1' for commands"
                        ;;
                    esac
                fi
            fi
            ;;
        "dbdir")
            ${ECHOCMD} "${DBDIR}"
            ;;
        "details")
            if [ -z "${LOGFILE}" ]; then DisplayError "Could not find log file to parse"; fi
            if [ $# -eq 1 ]; then
                DisplayError "This command needs a test ID (e.g. CORE-1000) to search for. This command is used after a scan (lynis audit system). Run 'lynis show tests' to see all available tests."
            else
                shift
                if [ $# -eq 1 ]; then
                    TESTID="$1"
                    awk -v search="Performing test ID $TESTID" '$0 ~ search {++f;p=1}p&&f==1;/====/{p=0}' ${LOGFILE}
                fi
            fi
            ;;
        "environment")
            if [ -z "${CONTAINER_TYPE}" ]; then
                ${ECHOCMD} "container=0"
            else
                ${ECHOCMD} "container=1"
                ${ECHOCMD} "container-type=${CONTAINER_TYPE}"
            fi
            if [ ${ISVIRTUALMACHINE} -eq 1 ]; then
                ${ECHOCMD} "virtual-machine=1"
                ${ECHOCMD} "virtual-machine-type=${VMTYPE}"
            else
                ${ECHOCMD} "hardware=1"
                ${ECHOCMD} "virtual-machine=0"
            fi
            ;;
        "eol")
            ${ECHOCMD} "Operating-system=${OS_FULLNAME}"
            if [ ${EOL} -eq 0 ]; then
                ${ECHOCMD} "End-of-life=No"
            elif [ ${EOL} -eq 1 ]; then
                ${ECHOCMD} "End-of-life=Yes"
            elif [ ${EOL} -eq 255 ]; then
                ${ECHOCMD} "End-of-life=Not tested"
            else
                ${ECHOCMD} "End-of-life=Unknown"
            fi
            ;;
        "groups")
            ViewGroups
            ;;
        "help" | "--help" | "-h")
            if [ $# -eq 1 ]; then
                ${ECHOCMD} "${PROGRAM_NAME} ${PROGRAM_VERSION} - Help"
                ${ECHOCMD} "=========================="
                ${ECHOCMD} ""
                ${ECHOCMD} "${WHITE}Commands${NORMAL}:"
                for ITEM in ${COMMANDS}; do
                    ${ECHOCMD} "${CYAN}${ITEM}${NORMAL}"
                done
                ${ECHOCMD} ""
                ${ECHOCMD} "Use 'lynis show help ${CYAN}<command>${NORMAL}' to see details"
                ${ECHOCMD} ""; ${ECHOCMD} ""
                ${ECHOCMD} "${WHITE}Options${NORMAL}:\n${GRAY}${OPTIONS}${NORMAL}"
            else
                shift
                case $1 in
                   "audit") ${ECHOCMD} "${AUDIT_HELP}" ;;
                   "configure") ${ECHOCMD} "No help available yet" ;;
                   "generate") ${ECHOCMD} "${GENERATE_HELP}" ;;
                   "show") ${ECHOCMD} "${SHOW_HELP}" ;;
                   "update") ${ECHOCMD} "${UPDATE_HELP}" ;;
                   "upload-only") ${ECHOCMD} "${UPLOAD_ONLY_HELP}" ;;
                   "?") ${ECHOCMD} "${SHOW_ARGS}" ;;
                   *) ${ECHOCMD} "Unknown argument provided for lynis show help" ;;
                esac
            fi
            ;;
        "helpers")              for ITEM in ${HELPERS}; do ${ECHOCMD} ${ITEM}; done ;;
        "hostids" | "hostid")
            ${ECHOCMD} "hostid=${HOSTID}"
            ${ECHOCMD} "hostid2=${HOSTID2}"
            ${ECHOCMD} "machineid=${MACHINEID}"
            ;;
        "includedir")
            ${ECHOCMD} "${INCLUDEDIR}"
            ;;
        "language")             ${ECHOCMD} "${LANGUAGE}" ;;
        "license")              ${ECHOCMD} "${PROGRAM_LICENSE}" ;;
        "logfile")              ${ECHOCMD} "${LOGFILE}" ;;
        "man")                  ${ECHOCMD} "Use ./lynis --man or man lynis" ;;
        "options")              ${ECHOCMD} "${OPTIONS}" ;;
        "os")
                                ${ECHOCMD} "OS=${OS}"
                                ${ECHOCMD} "OS_NAME=${OS_NAME}"
                                ${ECHOCMD} "OS_FULLNAME=${OS_FULLNAME}"
                                ${ECHOCMD} "OS_VERSION=${OS_VERSION}"
        ;;
        "pidfile")              ${ECHOCMD} "${PIDFILE}" ;;
        "profile" | "profiles") for ITEM in ${PROFILES}; do ${ECHOCMD} ${ITEM}; done ;;
        "profiledir")           ${ECHOCMD} "${PROFILEDIR}" ;;
        "plugindir")            ${ECHOCMD} "${PLUGINDIR}" ;;
        "release")              ${ECHOCMD} "${PROGRAM_VERSION}-${PROGRAM_RELEASE_TYPE}" ;;
        "releasedate")          ${ECHOCMD} "${PROGRAM_RELEASE_DATE}" ;;
        "report")               ${ECHOCMD} "${REPORTFILE}" ;;
        "settings")
            BRIEF_OUTPUT=0
            COLORED_OUTPUT=1
            CONFIGURED_ONLY_OUTPUT=0
            while [ $# -gt 1 ]; do
                shift
                case $1 in
                   "--brief" | "--br") BRIEF_OUTPUT=1 ;;
                   "--configured-only" | "--co") CONFIGURED_ONLY_OUTPUT=1 ;;
                   "--nocolors" | "--no-colors" | "--nc") COLORED_OUTPUT=0; COLORS=0 ;;
                   *)
                       ${ECHOCMD} "${RED}Error${NORMAL}: Invalid argument provided to 'lynis show settings'\n\n"
                       ${ECHOCMD} "Suggestions:"
                       for ITEM in ${SHOW_SETTINGS_ARGS}; do ${ECHOCMD} "lynis show settings ${ITEM}"; done
                       ExitFatal
                   ;;
                esac
            done
            if [ ${COLORED_OUTPUT} -eq 0 ]; then RemoveColors; fi
            # Sort all settings and display them
            SETTINGS=$(sort ${SETTINGS_FILE} | sed 's/ /:space:/g')
            for LINE in ${SETTINGS}; do
                SETTING=$(echo ${LINE} | awk -F';' '{print $1}')
                VALUE=$(echo ${LINE} | awk -F';' '{print $2}')
                DESCRIPTION=$(echo ${LINE} | awk -F';' '{print $3}' | sed 's/:space:/ /g')
                if [ -z "${VALUE}" -a ${CONFIGURED_ONLY_OUTPUT} -eq 0 ]; then VALUE="${GRAY}[not configured]${NORMAL}"; fi
                if [ -n "${VALUE}" ]; then
                    if [ ${BRIEF_OUTPUT} -eq 0 ]; then ${ECHOCMD} "${GRAY}# ${DESCRIPTION}${NORMAL}"; fi
                    ${ECHOCMD} "${WHITE}${SETTING}${NORMAL}=${CYAN}${VALUE}${NORMAL}"
                    if [ ${BRIEF_OUTPUT} -eq 0 ]; then ${ECHOCMD} ""; fi
                fi
            done
            if [ ${BRIEF_OUTPUT} -eq 0 -a ${CONFIGURED_ONLY_OUTPUT} -eq 0 -a ${COLORED_OUTPUT} -eq 1 ]; then
                if [ ${COLORS} -eq 1 ]; then
                    ${ECHOCMD} "# Add --brief to hide descriptions, --configured-only to show configured items only, or --nocolors to remove colors"
                else
                    ${ECHOCMD} "# Add --brief to hide descriptions, --configured-only to show configured items only"
                fi
            fi

            ;;
        "tests")
            if [ $# -gt 1 ]; then
                shift
                case $1 in
                    "skipped")
                        if [ -z "${SKIP_TESTS}" ]; then
                            ${ECHOCMD} "# ${CYAN}No tests are skipped (according profile)${NORMAL}"
                        else
                            ${ECHOCMD} "# Skipped tests (according profile)"
                            ${ECHOCMD} "${SKIP_TESTS}"
                        fi
                    ;;
                    *)
                        if [ -f ${DBDIR}/tests.db ]; then
                            SEARCH="$1"
                            FIND=$(grep "^${SEARCH}" ${DBDIR}/tests.db | sed "s/ /:space:/g")
                            if [ -z "${FIND}" ]; then
                                ${ECHOCMD} "${WARNING}Error${NORMAL}: ${BOLD}Could not find this test in the database${NORMAL}\n\n"
                                ExitFatal
                            else
                                for ITEM in ${FIND}; do
                                    TEST_DESCRIPTION=$(echo ${ITEM} | sed "s/:space:/ /g" | awk -F: '{print $6}')
                                    TEST=$(echo ${ITEM} | awk -F: '{print $1}')
                                    TEST_TYPE=$(echo ${ITEM} | awk -F: '{print $2}')
                                    TEST_CATEGORY=$(echo ${ITEM} | awk -F: '{print $3}')
                                    TEST_GROUP=$(echo ${ITEM} | awk -F: '{print $4}')
                                    TEST_OS=$(echo ${ITEM} | awk -F: '{print $5}')
                                    TEST_SKIPPED=0
                                    ${ECHOCMD} "${CYAN}${TEST}${NORMAL}"
                                    ${ECHOCMD} "==================================="
                                    ${ECHOCMD} ""
                                    ${ECHOCMD} "${WHITE}Type:${NORMAL} ${TEST_TYPE}"
                                    ${ECHOCMD} ""
                                    ${ECHOCMD} "${WHITE}Description:${NORMAL}"
                                    ${ECHOCMD} "${TEST_DESCRIPTION}"
                                    ${ECHOCMD} ""
                                    ${ECHOCMD} "${WHITE}Category:${NORMAL} ${TEST_CATEGORY}, ${WHITE}Group:${NORMAL} ${TEST_GROUP}"
                                    ${ECHOCMD} ""
                                    ${ECHOCMD} "${WHITE}Test Execution:${NORMAL}"
                                    if [ "${TEST_OS}" = "" ]; then
                                        ${ECHOCMD} "  Operating System:    ${GREEN}Yes${NORMAL} (all systems)"
                                    elif [ "${TEST_OS}" = "${OS}" ]; then
                                        ${ECHOCMD} "  Operating System:    ${GREEN}Yes${NORMAL} (${TEST_OS} only)"
                                    else
                                        ${ECHOCMD} "  Operating System:    ${RED}No${NORMAL} (${TEST_OS} only)"
                                        TEST_SKIPPED=1
                                    fi
                                    if [ -z "${SKIP_TESTS}" ]; then
                                        ${ECHOCMD} "  Profile:             ${GREEN}Yes${NORMAL} (not configured)"
                                    else
                                        FIND=$(echo ${SKIP_TESTS} | grep -E "${TEST}")
                                        if [ -z "${FIND}" ]; then
                                            ${ECHOCMD} "  Profile:             ${GREEN}Yes${NORMAL} (test not marked to be skipped)"
                                        else
                                            ${ECHOCMD} "  Profile:             ${RED}No${NORMAL} (marked test as to be skipped)"
                                            TEST_SKIPPED=1
                                        fi
                                    fi
                                    if [ ${TEST_SKIPPED} -eq 1 ]; then ${ECHOCMD} ""; ${ECHOCMD} "  This test will NOT be performed on this system"; fi

                                    ${ECHOCMD} ""
                                    ${ECHOCMD} ""

                                done
                            fi
                        else
                            ShowError "Can not find tests database"
                            ${ECHOCMD} "The changelog might not be installed on your system. Details can be found at ${PROGRAM_SOURCE}."
                            ExitFatal
                        fi
                    ;;
                esac
            else
                if [ -f ${DBDIR}/tests.db ]; then
                    ${ECHOCMD} "# Test       OS         Description"
                    ${ECHOCMD} "# ======================================================================================"
                    awk -F: '{ if ($1 !~ /^#/) printf("%-10s %-10s %s (%s)\n",$1,$5,$6,$3)}' ${DBDIR}/tests.db
                else
                    ShowError "Can not find tests database"
                    ${ECHOCMD} "The changelog might not be installed on your system. Details can be found at ${PROGRAM_SOURCE}."
                    ExitFatal
                fi
            fi
            ;;
        "version")              ${ECHOCMD} "${PROGRAM_VERSION}" ;;
        "workdir")              ${ECHOCMD} "${WORKDIR}" ;;
        "?")                    ${ECHOCMD} "${SHOW_ARGS}" ;;
        *)                      ${ECHOCMD} "Unknown argument '${RED}$1${NORMAL}' for lynis show" ;;
    esac
else
    ${ECHOCMD} "\n  ${WHITE}Provide an additional argument${NORMAL}\n\n"
    for ITEM in ${SHOW_ARGS}; do
        ${ECHOCMD} "    lynis show ${BROWN}${ITEM}${NORMAL}"
    done
    ${ECHOCMD} "\n"
    ${ECHOCMD} ""
    ${ECHOCMD} "Extended help about the show command can be provided with: $0 show commands show"
fi


ExitClean

# More additions:
# - categories
# - workdir

# The End
